/*
     *	jquery.suggest 1.1 - 2007-08-06
     *
     *	Uses code and techniques from following libraries:
     *	1. http://www.dyve.net/jquery/?autocomplete
     *	2. http://dev.jquery.com/browser/trunk/plugins/interface/iautocompleter.js
     *
     *	All the new stuff written by Peter Vulgaris (www.vulgarisoip.com)
     *	Feel free to do whatever you want with this file
     *
     */

(function($) {

    $.suggest = function(input, options) {

        var $input = $(input).attr("autocomplete", "off");
        var $results = $(document.createElement("div"));

        var timeout = false;		// hold timeout ID for suggestion results to appear
        var prevLength = 0;			// last recorded length of $input.val()
        var prevVal = "";           // last recorded val String
        var cache = [];				// cache MRU list
        var cacheSize = 0;			// size of cache in chars (bytes?)

        $results.addClass(options.resultsClass).appendTo('body');
        $results.css("width", input.offsetWidth-2);
        $results.css("padding-top",2);


        resetPosition();
        $(window)
                .load(resetPosition)// just in case user is changing size of page while loading
                .resize(resetPosition);
        timeout = setTimeout(suggest, options.delay);

        $input.blur(function() {
            setTimeout(function() {
                $results.hide()
            }, 200);
        });
			
			
			// help IE users if possible
        try {
            $results.bgiframe();
        } catch(e) {
        }


			// I really hate browser detection, but I don't see any other way
        if ($.browser.mozilla)
            $input.keypress(processKey);    // onkeypress repeats arrow keys in Mozilla/Opera
        else
            $input.keydown(processKey);		// onkeydown repeats arrow keys in IE/Safari


        function resetPosition() {
            // requires jquery.dimension plugin
            var offset = $input.offset();
            $results.css({
                top: (offset.top + input.offsetHeight+1) + 'px',
                left: offset.left + 'px'
            });
        }


        function processKey(e) {

            // handling up/down/escape requires results to be visible
            // handling enter/tab requires that AND a result to be selected
            if ((/27$|38$|40$/.test(e.keyCode) && $results.is(':visible')) ||
                (/^13$|^9$/.test(e.keyCode) && getCurrentResult())) {

                if (e.preventDefault)
                    e.preventDefault();
                if (e.stopPropagation)
                    e.stopPropagation();

                e.cancelBubble = true;
                e.returnValue = false;

                switch (e.keyCode) {

                    case 38: // up
                        prevResult();
                        break;

                    case 40: // down
                        nextResult();
                        break;

                    case 9:  // tab
                    case 13: // return
                        selectCurrentResult();
                        break;

                    case 27: //	escape
                        $results.hide();
                        break;

                }

            } else {
                /*
                        if (timeout)
                            clearTimeout(timeout);
                        timeout = setTimeout(suggest, options.delay);
                        prevLength = $input.val().length;

                        */
            }


        }


        function suggest() {

            timeout = setTimeout(suggest, options.delay);
            var q = $.trim($input.val());
            if (q.length >= options.minchars && prevVal != q) {
                prevVal = q;

                cached = checkCache(q);

                if (cached) {

                    displayItems(cached['items']);

                } else {

                    $.post(options.source, {q: q}, function(txt) {

                        //$results.hide();

                        var items = parseTxt(txt, q);

                        displayItems(items);
                        addToCache(q, items, txt.length);

                    });

                }

            }
            else {
                if (q.length < options.minchars) {
                    prevVal = q;
                    $results.hide();
                }
            }

        }


        function checkCache(q) {

            for (var i = 0; i < cache.length; i++)
                if (cache[i]['q'] == q) {
                    cache.unshift(cache.splice(i, 1)[0]);
                    return cache[0];
                }

            return false;

        }

        function addToCache(q, items, size) {

            while (cache.length && (cacheSize + size > options.maxCacheSize)) {
                var cached = cache.pop();
                cacheSize -= cached['size'];
            }

            cache.push({
                q: q,
                size: size,
                items: items
            });

            cacheSize += size;

        }

        function displayItems(items) {

            if (!items)
                return;

            if (!items.length) {
                $results.hide();
                return;
            }

            var html = '<table style="width:100%;border-collapse:collapse;border-width:0;border-style:none;"><tbody>';
            for (var i = 0; i < items.length; i++) {
                var parts = items[i].split(",");
                html += '<tr><td class="ac_word">' + parts[0] + '</td>' + '<td class="ac_desc">' + parts[1] + '</td></tr>';
            }
            html += "</tbody></table>"

            $results.html(html).show();
            jQuery("table > tbody > tr",$results).mouseover(function() {
                var currentResult = getCurrentResult();
                if(currentResult){
                    currentResult.removeClass(options.selectClass);
                }
                $(this).addClass(options.selectClass);
            }).click(function(e) {
                e.preventDefault();
                e.stopPropagation();
                selectCurrentResult();
            });
        }

        function parseTxt(txt, q) {

            var items = [];
            var tokens = txt.split(options.delimiter);
				
				// parse returned data for non-empty items
            for (var i = 0; i < tokens.length; i++) {
                var token = $.trim(tokens[i]);
                if (token) {
                    //token = token.replace(
                    //	new RegExp(q, 'ig'),
                    //	function(q) { return '<span class="' + options.matchClass + '">' + q + '</span>' }
                    //	);
                    items[items.length] = token;
                }
            }

            return items;
        }

        function getCurrentResult() {

            if (!$results.is(':visible'))
                return false;

            var $currentResult =jQuery("table > tbody > tr." +  options.selectClass,$results);// $results.children('tr.' + options.selectClass);

            if (!$currentResult.length)
                $currentResult = false;

            return $currentResult;

        }

        function selectCurrentResult() {

            $currentResult = getCurrentResult();

            if ($currentResult) {
                var text = jQuery(jQuery("td",$currentResult)[0]).text();
                $input.val(text);
                $results.hide();

                if (options.onSelect)
                    options.onSelect.apply($input[0]);

            }

        }

        function nextResult() {

            $currentResult = getCurrentResult();

            if ($currentResult)
                $currentResult
                        .removeClass(options.selectClass)
                        .next()
                        .addClass(options.selectClass);
            else{
                var table = $results.children("table");
                var tbody = table.children("tbody");
                var tr = tbody.children("tr")[0];
                jQuery(tr).addClass(options.selectClass);
                //$results.children('table tr:first-child').addClass(options.selectClass);
            }

        }

        function prevResult() {

            $currentResult = getCurrentResult();

            if ($currentResult)
                $currentResult
                        .removeClass(options.selectClass)
                        .prev()
                        .addClass(options.selectClass);
            else
            {
                var table = $results.children("table");
                var tbody = table.children("tbody");
                var tr = tbody.children("tr")[0];
                jQuery(tr).addClass(options.selectClass);
            }

        }

    }

    $.fn.suggest = function(source, options) {

        if (!source)
            return;

        options = options || {};
        options.source = source;
        options.delay = options.delay || 100;
        options.resultsClass = options.resultsClass || 'ac_results';
        options.selectClass = options.selectClass || 'ac_over';
        options.matchClass = options.matchClass || 'ac_match';
        options.minchars = options.minchars || 2;
        options.delimiter = options.delimiter || '\n';
        options.onSelect = options.onSelect || false;
        options.maxCacheSize = options.maxCacheSize || 65536;

        this.each(function() {
            new $.suggest(this, options);
        });

        return this;

    };

})(jQuery);
	
